Thermoforming process and apparatus

Details Thermoforming process and apparatus Thermoforming process and apparatus

1998-02-23

2000-07-11

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of process trim or excess blanked material

264550, 264551, 264555, 264334, 4253261, 4253871, 425388, 425443, B29C 5122, B29C 5144

Patent

active

060868007

ABSTRACT:
This invention is an improved thermoforming process and apparatus for the production of rigid plastic containers. The apparatus employs a molten sheet of thermoplastic material that is processed through two extrusion rolls, thermoformed on the periphery of a rotating form tool, mechanically ejected from the form tool, conveyed to a conventional punch press where the formed articles are trimmed from the sheet then packaged for shipment. The operation of the extruder, extrusion rolls, forming wheel, mechanical ejection and trim stations are operated as a continuous, integrated system.

REFERENCES:
patent: 3181202 (1965-05-01), Martelli et al.
patent: 4235579 (1980-11-01), Kurz et al.
patent: 4250129 (1981-02-01), Winstead
patent: 4421712 (1983-12-01), Winstead
patent: 4722820 (1988-02-01), Flecknoe-Brown
patent: 4994229 (1991-02-01), Flecknoe-Brown

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